+ =
﹣ =
× =
÷ =
15×0.4=
10÷2.5=
2.4×5=
0.78÷1.3=
1÷ =
17× =
3﹣4× =
1﹣ ﹣ =
28×( + )=
1 × =
A.青青
B.姐姐
C.妈妈
×